The National Organization for Marriage hopes revelations about the IRS unfairly targeting conservative groups can revitalize an investigation into who leaked its donor information last year.

“This is what happens in the Soviet Union,” NOM President Brian Brown told POLITICO on Monday. “This is not what happens in the United States of America.”

In April 2012, the Huffington Post and the Human Rights Campaign posted documents showing GOP presidential nominee Mitt Romney donated $10,000 to NOM in 2008. The anti-gay marriage group immediately cried foul and called for the Treasury Inspector General for Tax Administration — the same investigators who are set to release a report on the IRS targeting later this week — to investigate, accusing IRS employees of leaking the documents.

TIGTA has questioned both Brown and the group’s board chairman, but Brown said there was nothing in their questions to indicate TIGTA thought the release of their IRS information was related to a broader plot to target conservatives. Still, Brown believes the IRS’ centralization of handling of nonprofit groups in a Cincinnati, Ohio, office may have given the same employees now blamed for the targeting an opportunity to leak the documents.

Brown said the group wants a congressional hearing to look into the document release, since the group’s attempts to use the Freedom of Information Act to stay updated on the case have been unsuccessful.

“Without a congressional hearing and Congress’ subpoena power, where are we?” Brown asked. “All we’re getting is what [the IRS] wants to say.”

The IRS apologized Friday for singling out tea party groups’ application for nonprofit status for further scrutiny. A draft copy of the TIGTA report, obtained Monday by POLITICO, shows the IRS also targeted a broader array of political groups. The revelations have driven bipartisan outrage, with Republicans relentlessly hammering the agency and President Barack Obama calling the targeting “outrageous.”